1. The cheapest thing on the menu at most fast-food places. Homeless people come to a place that serves nachos with 40 cents, asking for just the extra cheese.
2. The absolute worst thing to buy and split with your girlfriend on a date.
3. A person that is cheap.

Cindy: Hey Marissa, where did Carlos take you on that date?
Marissa: Oh my god, he took me a movie theatre just to split extra cheese (2) with me!
Cindy: Wow, I never took Carlos for such an extra cheese (3).